:root{
  --bg:#0b0e13;
  --bg2:#0e131b;
  --cyan:#35e1ff;
  --cyan-dim:#1d8aa6;
  --ink:#04121a;
  --panel:rgba(16,21,30,.66);
  --panel-strong:rgba(12,16,24,.9);
  --stroke:rgba(120,200,230,.18);
  --stroke-2:rgba(120,200,230,.32);
  --txt:#e9f4fb;
  --muted:#93a7b8;
  --font:'Inter','SF Pro Display','Segoe UI',system-ui,-apple-system,Arial,sans-serif;
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth;scroll-padding-top:78px}
body{background:var(--bg);font-family:var(--font);color:var(--txt);line-height:1.55;
  overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3{line-height:1.1;letter-spacing:-.01em}
section{scroll-margin-top:78px}

/* ---------- brand mark ---------- */
.brand{display:flex;align-items:center;gap:11px}
.brand-mark{width:30px;height:30px;border-radius:8px;flex:none;
  background:conic-gradient(from 200deg,#35e1ff,#1d8aa6,#35e1ff);
  box-shadow:0 0 16px rgba(53,225,255,.45);position:relative}
.brand-mark::after{content:"";position:absolute;inset:6px;border-radius:4px;background:var(--bg)}
.brand-text b{display:block;font-weight:800;letter-spacing:.14em;font-size:14px}
.brand-text i{display:block;font-style:normal;color:var(--muted);font-size:10.5px;letter-spacing:.06em;margin-top:1px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid transparent;cursor:pointer;
  font:inherit;font-weight:700;font-size:14px;padding:12px 20px;border-radius:12px;transition:.2s;white-space:nowrap}
.btn-primary{color:var(--ink);background:linear-gradient(180deg,#3fe6ff,#15b0d6);
  box-shadow:0 10px 30px rgba(53,225,255,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 40px rgba(53,225,255,.5)}
.btn-ghost{color:var(--txt);background:rgba(255,255,255,.04);border-color:var(--stroke-2)}
.btn-ghost:hover{background:rgba(53,225,255,.1);border-color:var(--cyan)}
.btn-lg{padding:16px 28px;font-size:15px}

.eyebrow{color:var(--cyan);font-size:12px;font-weight:700;letter-spacing:.22em;text-transform:uppercase;margin-bottom:14px}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:24px;
  padding:14px clamp(16px,5vw,42px);
  background:rgba(8,11,16,.72);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--stroke)}
.nav-links{display:flex;gap:26px;margin-left:auto;font-size:14px;color:var(--muted)}
.nav-links a{transition:.2s}
.nav-links a:hover{color:var(--cyan)}
.nav-cta{margin-left:6px}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:clamp(48px,9vw,110px) clamp(16px,5vw,42px) clamp(40px,7vw,80px);
  background:radial-gradient(110% 90% at 80% 0%,#16202e 0%,var(--bg) 55%)}
.hero-glow{position:absolute;top:-30%;right:-10%;width:60vw;height:60vw;pointer-events:none;
  background:radial-gradient(circle,rgba(53,225,255,.16),transparent 60%);filter:blur(20px)}
.hero-inner{position:relative;max-width:var(--maxw);margin:0 auto;display:grid;
  grid-template-columns:1.3fr .9fr;gap:48px;align-items:center}
.hero-copy h1{font-size:clamp(34px,5.4vw,62px);font-weight:800;margin:6px 0 18px}
.hero-copy h1 span{color:var(--cyan)}
.hero-copy p{color:var(--muted);font-size:clamp(15px,1.6vw,18px);max-width:34em}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin:28px 0 30px}
.hero-stats{display:flex;gap:34px;flex-wrap:wrap}
.hero-stats b{display:block;color:var(--cyan);font-size:30px;font-weight:800;line-height:1}
.hero-stats span{color:var(--muted);font-size:12.5px;letter-spacing:.04em}
.hero-card{background:linear-gradient(180deg,rgba(20,28,40,.9),rgba(10,14,20,.86));
  border:1px solid var(--stroke-2);border-radius:20px;padding:26px;
  box-shadow:0 30px 80px rgba(0,0,0,.5)}
.hero-card-tag{display:inline-block;color:var(--cyan);font-size:11px;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;border:1px solid var(--stroke-2);border-radius:20px;padding:5px 12px;margin-bottom:18px}
.hero-card-spec b{font-size:38px;font-weight:800;display:block;line-height:1}
.hero-card-spec span{color:var(--muted);font-size:13px}
.hero-card ul{list-style:none;margin:18px 0;display:grid;gap:10px}
.hero-card li{position:relative;padding-left:22px;font-size:14px;color:var(--txt)}
.hero-card li::before{content:"";position:absolute;left:0;top:7px;width:9px;height:9px;border-radius:50%;
  background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
.hero-card-link{display:inline-block;margin-top:6px;color:var(--cyan);font-weight:700;font-size:14px}

/* ---------- generic section ---------- */
.section{max-width:var(--maxw);margin:0 auto;padding:clamp(56px,8vw,100px) clamp(16px,5vw,42px)}
.section-alt{max-width:none;background:linear-gradient(180deg,var(--bg2),var(--bg))}
.section-alt>*{max-width:var(--maxw);margin-left:auto;margin-right:auto}
.section-head{max-width:760px;margin-bottom:42px}
.section-head h2{font-size:clamp(26px,3.6vw,42px);font-weight:800;margin-bottom:14px}
.lead{color:var(--muted);font-size:clamp(15px,1.5vw,17.5px)}

/* ---------- features / cards ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.feature{background:var(--panel);border:1px solid var(--stroke);border-radius:16px;padding:26px;transition:.2s}
.feature:hover{border-color:var(--stroke-2);transform:translateY(-3px)}
.feature-ico{width:44px;height:44px;display:grid;place-items:center;border-radius:11px;font-size:20px;
  color:var(--cyan);background:rgba(53,225,255,.1);border:1px solid var(--stroke-2);margin-bottom:16px}
.feature h3{font-size:18px;margin-bottom:8px}
.feature p{color:var(--muted);font-size:14px}
.card{background:var(--panel);border:1px solid var(--stroke);border-radius:16px;padding:24px;transition:.2s}
.card:hover{border-color:var(--cyan);box-shadow:0 16px 40px rgba(0,0,0,.4)}
.card-num{color:var(--cyan-dim);font-size:13px;font-weight:800;letter-spacing:.12em}
.card h3{font-size:16.5px;margin:12px 0 8px}
.card p{color:var(--muted);font-size:13.5px}

/* ---------- project ---------- */
.project{display:grid;grid-template-columns:.8fr 1.2fr;gap:24px;align-items:start}
.project>div{background:var(--panel);border:1px solid var(--stroke);border-radius:18px;padding:28px}
.project h3{font-size:18px;margin-bottom:18px}
.specs{list-style:none;display:grid;gap:2px}
.specs li{display:flex;justify-content:space-between;align-items:baseline;padding:11px 0;border-bottom:1px solid var(--stroke)}
.specs li:last-child{border-bottom:none}
.specs span{color:var(--muted);font-size:14px}
.specs b{color:var(--cyan);font-size:17px;font-weight:800}
.chips-row{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:24px}
.chips-row span{font-size:13px;color:var(--txt);background:rgba(255,255,255,.04);
  border:1px solid var(--stroke-2);border-radius:20px;padding:8px 14px}

/* ---------- viewer (embedded 3D) ---------- */
.model-section .section-head{margin-bottom:24px}
.viewer{position:relative;width:100%;height:min(78vh,720px);border-radius:20px;overflow:hidden;
  border:1px solid var(--stroke-2);background:#0a0e14;box-shadow:0 30px 90px rgba(0,0,0,.55);touch-action:none}
.viewer #scene{position:absolute;inset:0;width:100%;height:100%;display:block}
.viewer-controls{position:absolute;left:16px;bottom:16px;display:flex;gap:8px;flex-wrap:wrap;z-index:3}
.vc-btn{font:inherit;font-size:13px;font-weight:600;color:var(--txt);cursor:pointer;
  padding:10px 15px;border-radius:11px;background:var(--panel-strong);border:1px solid var(--stroke);
  backdrop-filter:blur(12px);transition:.2s}
.vc-btn:hover{border-color:var(--cyan);background:rgba(53,225,255,.12)}
.vc-btn.active{background:linear-gradient(180deg,rgba(53,225,255,.24),rgba(53,225,255,.06));
  border-color:var(--cyan);box-shadow:0 0 16px rgba(53,225,255,.25)}
.vc-toggle.on{background:linear-gradient(180deg,rgba(255,210,120,.22),rgba(255,210,120,.05));
  border-color:#ffcf7a;color:#ffe6bd}
.viewer-hint{position:absolute;right:16px;bottom:18px;z-index:3;color:var(--muted);font-size:12px;
  background:var(--panel-strong);border:1px solid var(--stroke);border-radius:10px;padding:8px 13px;backdrop-filter:blur(10px)}
.viewer-walkhint{position:absolute;left:50%;top:18px;transform:translateX(-50%);z-index:3;text-align:center;
  background:var(--panel-strong);border:1px solid var(--stroke);border-radius:12px;padding:11px 20px;backdrop-filter:blur(12px)}
.viewer-walkhint b{display:block;color:var(--cyan);letter-spacing:.1em;font-size:12px;text-transform:uppercase}
.viewer-walkhint span{display:block;font-size:13px;margin-top:5px}
.viewer-walkhint small{display:block;color:var(--muted);font-size:11px;margin-top:4px}
.viewer-loading{position:absolute;inset:0;z-index:5;display:grid;place-items:center;
  background:radial-gradient(120% 120% at 50% 35%,#101723,#070a0f 75%);transition:opacity .7s,visibility .7s}
.viewer-loading.gone{opacity:0;visibility:hidden}
.vl-logo{font-weight:800;letter-spacing:.3em;font-size:clamp(18px,3vw,28px);text-align:center}
.vl-logo span{color:var(--cyan);margin-left:.3em}
.vl-bar{margin:20px auto 0;width:min(240px,60vw);height:3px;border-radius:3px;background:rgba(255,255,255,.08);overflow:hidden}
.vl-bar i{display:block;height:100%;width:40%;border-radius:3px;
  background:linear-gradient(90deg,transparent,var(--cyan),transparent);animation:vl 1.2s infinite ease-in-out}
@keyframes vl{0%{transform:translateX(-120%)}100%{transform:translateX(320%)}}
.vl-hint{margin-top:14px;color:var(--cyan-dim);font-size:12px;letter-spacing:.08em;text-align:center}

/* ---------- contact ---------- */
.contact-card{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;justify-content:space-between;
  gap:30px;flex-wrap:wrap;background:linear-gradient(120deg,rgba(20,28,40,.92),rgba(10,14,20,.88));
  border:1px solid var(--stroke-2);border-radius:22px;padding:clamp(28px,4vw,46px)}
.contact-copy h2{font-size:clamp(24px,3vw,36px);font-weight:800;margin-bottom:12px;max-width:14em}
.contact-copy p{color:var(--muted);max-width:38em;font-size:15px}
.contact-rows{display:flex;gap:22px;flex-wrap:wrap;margin-top:18px}
.contact-rows a{color:var(--cyan);font-weight:700;font-size:15px}

/* ---------- footer ---------- */
.footer{max-width:var(--maxw);margin:0 auto;padding:30px clamp(16px,5vw,42px);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  border-top:1px solid var(--stroke)}
.footer-note{color:var(--muted);font-size:12.5px}

.hidden{display:none!important}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .hero-inner{grid-template-columns:1fr;gap:34px}
  .grid-3,.grid-4{grid-template-columns:1fr 1fr}
  .project{grid-template-columns:1fr}
  .nav-links{display:none}
}
@media (max-width:560px){
  .grid-3,.grid-4{grid-template-columns:1fr}
  .nav-cta{display:none}
  .hero-stats{gap:24px}
  .viewer{height:64vh}
  .viewer-hint{display:none}
  .contact-card{flex-direction:column;align-items:flex-start}
}